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bof
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225
How to find a general sum formula for the series: 5+55+555+5555+.....?
Nov 16, 2014
77
'Obvious' theorems that are actually false
Jun 5, 2014
69
'Obvious' theorems that are actually false
Jun 5, 2014
55
Proofs of AM-GM inequality
Feb 21, 2016
54
$\mathbb{R}$ with the lower limit topology is not second-countable
Feb 6, 2015
51
How to find the mod of this large number
Dec 13, 2016
51
Can $18$ consecutive integers be separated into two groups such that their product is equal?
Jan 15, 2014
44
If $\lvert\operatorname{Hom}(H,G_1)\rvert = \lvert\operatorname{Hom}(H,G_2)\rvert$ for any $H$ then $G_1 \cong G_2$
Dec 22, 2013
43
A simple finite combinatorial sum I found, that seems to work, would have good reasons to work, but I can't find in the literature.
Dec 6, 2018
37
What is the expected value of the largest of the three dice rolls?
Mar 14, 2016

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Responses tab on activity page doesn't work

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51
Mathematicians with both “very abstract” and “very applied” achievements
39
Mathematicians with both “very abstract” and “very applied” achievements
37
What is the general opinion on the Generalized Continuum Hypothesis?
29
Widely accepted mathematical results that were later shown to be wrong?
28
What is the highest number of different mates in 1 you can have in one (legal) position?